Abstract

We report experimental realization of Raman spectra enhancement of copper phthalocyanine, using an on-chip metallic planar waveguide of the sub-millimeter scale. The oscillating ultrahigh order modes excited by the direct coupling method yield high optical intensity at resonance, which is different from the conventional strategy to create localized “hot spots.” The observed excitation efficiency of the Raman signal is significantly enhanced, owing to the high Q factor of the resonant cavity. Furthermore, effective modulation of the Raman intensity is available by adjusting the polymethyl methacrylate (PMMA) thickness in the guiding layer, i.e., by tuning the light–matter interaction length. A large modulation depth is verified through the fact that 10 times variation in the enhancement factor is observed in the experiment as the PMMA thickness varies from 7 to 23 μm.

© 2018 Chinese Laser Press

Application of attenuated total reflection surface-plasmon-polariton Raman spectroscopy to gold and copper

Masayuki Futamata
Appl. Opt. 36(1) 364-375 (1997)

Dependence of surface enhanced Raman scattering on the plasmonic template periodicity

P. Mandal and S. Anantha Ramakrishna
Opt. Lett. 36(18) 3705-3707 (2011)

Surface-enhanced Raman scattering by composite structure of gold nanocube-PMMA-gold film

Xiangxian Wang, Xuelin Bai, Zhiyuan Pang, Jiankai Zhu, Yuan Wu, Hua Yang, Yunping Qi, and Xiaolei Wen
Opt. Mater. Express 9(4) 1872-1881 (2019)

Enhanced Raman spectroscopy by a double cavity metal-cladding waveguide

Tian Xu, Yan Lu, Jianfeng Li, Cheng Yin, Yonglong Jin, Meng Wang, Jinghuai Fang, Chaonan Wang, and Yihang Ge
Appl. Opt. 56(1) 115-119 (2017)

Modulation of hot regions in waveguide-based evanescent-field-coupled localized surface plasmons for plasmon-enhanced spectroscopy

Hailong Wang, Yuyang Wang, Yi Wang, Weiqing Xu, and Shuping Xu
Photon. Res. 5(5) 527-535 (2017)